OBD-II code · Powertrain (manufacturer / generic)
P34AF A Camshaft Position Actuator Position Sensor A Circuit High Bank 1
Cam actuator A position sensor on bank 1 signal voltage above expected range. The camshaft position sensor identifies which cylinder is on the compression stroke — without it the ECM cannot run sequential injection or coil-on-plug ignition correctly.
Is it safe to drive with P34AF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire open
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Cam Actuator A Pos Sensor B1, Sensor Wiring
Related codes
- P2B42A Camshaft Position Actuator Position Sensor B Circuit High Bank 1
- P2B46A Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- P2B4AB Camshaft Position Actuator Position Sensor B Circuit High Bank 1
- P2B4EB Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- P34B3A Camshaft Position Actuator Position Sensor A Circuit High Bank 2
- P34BFB Camshaft Position Actuator Position Sensor A Circuit High Bank 1
- P34C3B Camshaft Position Actuator Position Sensor A Circuit High Bank 2
- P34ACA Camshaft Position Actuator Position Sensor A Circuit Bank 1
- P34ADA Camshaft Position Actuator Position Sensor A Range/Performance Bank 1
- P34AEA Camshaft Position Actuator Position Sensor A Circuit Low Bank 1
- P34B0A Camshaft Position Actuator Position Sensor A Circuit Bank 2
- P34B1A Camshaft Position Actuator Position Sensor A Range/Performance Bank 2
- P34B2A Camshaft Position Actuator Position Sensor A Circuit Low Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.